tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Bluetooth HCI driver model support. */
3
4#include <linux/module.h>
5
6#include <net/bluetooth/bluetooth.h>
7#include <net/bluetooth/hci_core.h>
8
9static struct class *bt_class;
10
11static void bt_link_release(struct device *dev)
12{
13 struct hci_conn *conn = to_hci_conn(dev);
14 kfree(conn);
15}
16
17static const struct device_type bt_link = {
18 .name = "link",
19 .release = bt_link_release,
20};
21
22/*
23 * The rfcomm tty device will possibly retain even when conn
24 * is down, and sysfs doesn't support move zombie device,
25 * so we should move the device before conn device is destroyed.
26 */
27static int __match_tty(struct device *dev, void *data)
28{
29 return !strncmp(dev_name(dev), "rfcomm", 6);
30}
31
32void hci_conn_init_sysfs(struct hci_conn *conn)
33{
34 struct hci_dev *hdev = conn->hdev;
35
36 BT_DBG("conn %p", conn);
37
38 conn->dev.type = &bt_link;
39 conn->dev.class = bt_class;
40 conn->dev.parent = &hdev->dev;
41
42 device_initialize(&conn->dev);
43}
44
45void hci_conn_add_sysfs(struct hci_conn *conn)
46{
47 struct hci_dev *hdev = conn->hdev;
48
49 BT_DBG("conn %p", conn);
50
51 if (device_is_registered(&conn->dev))
52 return;
53
54 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
55
56 if (device_add(&conn->dev) < 0) {
57 bt_dev_err(hdev, "failed to register connection device");
58 return;
59 }
60
61 hci_dev_hold(hdev);
62}
63
64void hci_conn_del_sysfs(struct hci_conn *conn)
65{
66 struct hci_dev *hdev = conn->hdev;
67
68 if (!device_is_registered(&conn->dev))
69 return;
70
71 while (1) {
72 struct device *dev;
73
74 dev = device_find_child(&conn->dev, NULL, __match_tty);
75 if (!dev)
76 break;
77 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
78 put_device(dev);
79 }
80
81 device_del(&conn->dev);
82
83 hci_dev_put(hdev);
84}
85
86static void bt_host_release(struct device *dev)
87{
88 struct hci_dev *hdev = to_hci_dev(dev);
89
90 if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
91 hci_release_dev(hdev);
92 else
93 kfree(hdev);
94 module_put(THIS_MODULE);
95}
96
97static const struct device_type bt_host = {
98 .name = "host",
99 .release = bt_host_release,
100};
101
102void hci_init_sysfs(struct hci_dev *hdev)
103{
104 struct device *dev = &hdev->dev;
105
106 dev->type = &bt_host;
107 dev->class = bt_class;
108
109 __module_get(THIS_MODULE);
110 device_initialize(dev);
111}
112
113int __init bt_sysfs_init(void)
114{
115 bt_class = class_create("bluetooth");
116
117 return PTR_ERR_OR_ZERO(bt_class);
118}
119
120void bt_sysfs_cleanup(void)
121{
122 class_destroy(bt_class);
123}